A tax planning strategy that has become increasingly popular among startup founders and venture investors is now squarely in the crosshairs of the U.S. Treasury Department and the IRS.
According to a new Wall Street Journal report, federal officials are preparing guidance aimed at limiting “trust stacking”—a strategy used to multiply the tax benefits available under the Qualified Small Business Stock (QSBS) rules of Internal Revenue Code Section 1202.
QSBS has long been one of the most valuable tax incentives available to entrepreneurs, allowing eligible shareholders to exclude up to $15 million of gain (or 10 times basis, if greater) on the sale of qualifying stock. Recent legislative changes expanded the benefit by increasing both the per-taxpayer exclusion amount and the size threshold for qualifying businesses, making the incentive even more attractive.
Rather than relying on a single exclusion, many founders have begun transferring QSBS shares into multiple irrevocable trusts established for family members. Because each trust may be treated as a separate taxpayer, each can potentially qualify for its own Section 1202 exclusion. In some cases, advisers have marketed structures capable of increasing the available tax-free gain from $15 million to $60 million or substantially more.
How will ‘Trust Stacking’ be Regulated
That rapid growth has drawn the attention of Treasury officials. Kenneth Kies, Treasury’s Assistant Secretary for Tax Policy, publicly warned that the administration “doesn’t like stacking,” signaling that regulations intended to curb aggressive versions of the strategy are forthcoming. While ordinary family estate planning appears less likely to be targeted, Treasury has expressed particular concern over arrangements involving overlapping or synthetic trusts designed primarily to multiply exclusions for the same economic beneficiaries.
“Let me just warn you, we don’t like stacking, OK?”, said Kenneth Kies, the Treasury’s top tax-policy official.
The article notes that the government faces a difficult balancing act. Section 1202 expressly allows QSBS to retain its favorable tax treatment when transferred by gift, providing the statutory foundation for many legitimate trust-planning techniques. As a result, Treasury’s ability to eliminate trust stacking entirely may be constrained, leaving regulators to focus instead on transactions they view as abusive.
Planning Considerations In Light of the Forthcoming Regulations
Tax practitioners interviewed by the Journal largely agree on one point: timing and purpose matter. Advisors caution that trusts created shortly before a company sale—or structures lacking genuine estate-planning objectives—are significantly more vulnerable to IRS challenge. By contrast, transfers made while the company is still in its early stages, when stock values are low and accompanied by legitimate donative intent, are generally viewed as more defensible.
Paul Lee of Consiglio Advisors illustrated that tension with a particularly aggressive example. He told the Journal that two unmarried, childless co-founders had come to him with a plan involving 18 trusts structured so that the brothers could potentially be added back as beneficiaries after a sale. Lee said he advised them against it.
“If the only motivation is just to multiply the $15 million per taxpayer exclusion just for the benefit of themselves, that’s where it goes too far.”, said Paul Lee of Consiglio Advisors
That distinction captures the boundary many practitioners seem to recognize between legitimate estate planning and more aggressive exclusion-multiplication strategies. Trust planning itself is not new, and for many families it remains a valid part of broader estate, succession, and wealth-transfer planning. But structures that appear to exist primarily to enlarge the tax exclusion for the same people are increasingly likely to attract scrutiny.
The growing popularity of QSBS planning has also fueled an expanding ecosystem of legal, tax, and technology providers offering standardized trust-stacking solutions. As the article observes, what was once a niche estate-planning technique has become a mainstream component of startup tax planning, particularly in Silicon Valley.
For founders, investors, and their advisors, the message is becoming increasingly clear: QSBS remains one of the most powerful tax incentives available, but the IRS is preparing to draw firmer boundaries around how far taxpayers can go in multiplying its benefits. Until formal guidance is issued, practitioners should expect increased audit scrutiny and emphasize that any trust-planning strategy should be supported by bona fide estate-planning objectives rather than tax savings alone.
This article does not constitute legal or tax advice. Please consult with your legal or tax advisor with respect to your particular circumstance.